When a prophecy traps a kingdom in eternal winter, Anna (voice of Kristen Bell), a fearless optimist, teams up with extreme mountain man Kristoff (Groff) and his sidekick reindeer Sven on an epic journey to find Anna's sister Elsa (voice of Idina Menzel), the Snow Queen, and put an end to her icy spell. Encountering mystical trolls, an amazing and comedic snowman named Olaf, Everest-like conditions and magic at every turn, Anna and Kristoff battle the elements in a race to save the kingdom from destruction.